Extremely often..that's why i have so many Saturn games to sell. I never wanted all of those,but getting lots of games are the cheapest way to get the games at the best price..but you have to sell back the ones you don't need,and i have hundreds now
I used Daigirin list
Sega Japanj official list (back when it was online on their japanese website)
this list:http://homepage2.nifty.com/gamedatab...C3_SS_top.html
and satakore list.